Notes:
- 1) The fitting includes the systematic errors.
- 2) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
- 3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.
Time averaged spectrum fit using the average DRM
Power-law model
Time interval is from 0.008 sec. to 6.008 sec.
Spectral model in power-law:
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Parameters : value lower 90% higher 90%
Photon index: -2.10342 ( -0.186299 0.176988 )
Norm@50keV : 1.45787E-02 ( -0.00169491 0.00165153 )
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#Fit statistic : Chi-Squared 58.01 using 59 bins.
Reduced chi-squared = 1.01772
# Null hypothesis probability of 4.38e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 6 sec: 2.29769 ( -0.21355 0.21397 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.13132e-07 ( -8.4495e-08 8.56644e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.008 sec. to 6.008 sec.
Spectral model in the cutoff power-law:
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Parameters : value lower 90% higher 90%
Photon index: -2.16183 ( -0.0057792 0.615652 )
Epeak [keV] : 117.533 ( )
Norm@50keV : 1.35174E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared 57.98 using 59 bins.
Reduced chi-squared = 1.03536
# Null hypothesis probability of 4.02e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 6 sec: 2.27301 ( -0.20683 0.20677 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.08056e-07 ( -9.22896e-08 9.78672e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 1.008 sec. to 2.008 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.11966 ( -0.307992 0.277021 )
Norm@50keV : 2.31208E-02 ( -0.00458717 0.0043891 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 50.22 using 59 bins.
Reduced chi-squared = 0.881053
# Null hypothesis probability of 7.26e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 3.67353 ( -0.54986 0.55039 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.15283e-07 ( -3.73895e-08 3.81248e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.008 sec. to 2.008 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.83226 ( -0.295829 1.31798 )
Epeak [keV] : 25.8867 ( -20.6072 -25.8844 )
Norm@50keV : 3.34594E-02 ( -0.0180697 0.14785 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 50.02 using 59 bins.
Reduced chi-squared = 0.893214
# Null hypothesis probability of 7.00e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 3.63735 ( -0.56883 0.5586 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.11106e-07 ( -3.98405e-08 4.10156e-08 ) ergs/cm2
Time-resolved spectra
